Arsenoflorencite-(Ce) Mineral Data

General Arsenoflorencite-(Ce) Information

Chemical Formula:

(Ce,La)Al3(AsO4)2(OH)6

Composition:

Molecular Weight = 588.17 gm

Lanthanum 7.08 % La 8.31 % La₂O₃

Cerium 11.91 % Ce 13.95 % Ce₂O₃

La,Ce,Pr,Nd,Sm, 4.90 % RE 5.71 % REE₂O₃

Aluminum 13.76 % Al 26.00 % Al₂O₃

Arsenic 21.65 % As 33.22 % As₂O₅

Phosphorus 1.58 % P 3.62 % P₂O₅

Hydrogen 1.03 % H 9.19 % H₂O

Oxygen 38.08 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ce_0.5La_0.3REE_0.2Al₃(AsO₄)_1.7(PO₄)_0.3(OH)₆

Environment:

Detrital grains in a heavy mineral concentrates.

IMA Status:

Approved IMA 1987

Locality:

Kimba, Eyre Peninsula, South Australia. Link to MinDat.org Location Data.

Name Origin:

Named as the arsenic analog of florencite and the dominant rare earth element, cerium.

Name Pronunciation:

Arsenoflorencite-(Ce) + Pronunciation

Arsenoflorencite-(Ce) Image

Images:

Arsenoflorencite-(Ce)

Comments: SEM image of euhedral crystal of arsenoflorencite-(Ce). (MinMag, v51:605).
Location: Stream-sediment sample taken on the Kimba 1:250000 mapsheet on the Eyre Peninsula in South Australia. Scale: See Image.
© Mineralogical Magazine

Arsenoflorencite-(Ce) Crystallography

Axial Ratios:

a:c = 1:2.34983

Cell Dimensions:

a = 7.029, c = 16.517, Z = 3; V = 706.72 Den(Calc)= 4.15

Crystal System:

Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.963(1), 3.513(0.6), 1.905(0.5),

Physical Properties of Arsenoflorencite-(Ce)

Cleavage:

None

Color:

White, Pale brown, Colorless.

Density:

4.096

Diaphaneity:

Translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Subhedral Crystals - Occurs as crystals which tend to exhibit a recognizable crystal shape.

Hardness:

3.5 - Copper Penny

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Arsenoflorencite-(Ce)

Gladstone-Dale:

CI meas= 0.023 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.035 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1788,KPDmeas= 0.1812,KC= 0.1853
Ncalc = 1.76 - 1.77

Optical Data:

Uniaxial (+), w=1.739, e=1.745, bire=0.0060.

Calculated Properties of Arsenoflorencite-(Ce)

Electron Density:

Bulk Density (Electron Density)=3.84 gm/cc
note: Specific Gravity of Arsenoflorencite-(Ce) =4.10 gm/cc.

Fermion Index:

Fermion Index = 0.0093583653
Boson Index = 0.9906416347

Photoelectric:

PE_{Arsenoflorencite-(Ce)}= 136.12 barns/electron
U=PE_{Arsenoflorencite-(Ce)} x r_electron= 523.09 barns/cc.

Radioactivity:

GRapi = 23,926.95 (Gamma Ray American Petroleum Institute Units)
Concentration of Arsenoflorencite-(Ce) per GRapi unit = 41.79 (PPM)

Arsenoflorencite-(Ce) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

**Estimated Radioactivity from Arsenoflorencite-(Ce)** - weak
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Bequerols (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 7.75 cm	535,586	1.45E-05	23,926.95	7.87
100 gm / 3.60 cm	53,559	1.45E-06	2,392.70	0.79
10 gm / 1.67 cm	5,356	1.45E-07	239.27	0.08
1 gm / 7.75 mm	536	1.45E-08	23.93	0.01
0.1 gm / 3.60 mm	54	1.45E-09	2.39	0.00
0.01 gm / 1.67 mm	5	1.45E-10	0.24	0.00
0.001 gm / 0.78 mm	1	1.45E-11	0.02	0.00

Weight of pure Arsenoflorencite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.10 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
Estimated Thorium Activity ( 1.19 % Th) From Sum REE Elements (23.89 % REE)

Arsenoflorencite-(Ce) Classification

Dana Class:

41.05.11.01 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.05)where (A B)2 (XO4) Zq

(41.05.11)Arsenoflorencite Group

41.05.11.01 Arsenoflorencite-(Ce) (Ce,La)Al3(AsO4)2(OH)6 R 3m 3 2/m

41.05.11.02 Arsenoflorencite-(Nd)* (Nd,La,Ce,Ba)(Al,Fe)3(AsO4,PO4)2(OH)6 R 3m 3m

41.05.11.03 Arsenoflorencite-(La)* (La,Sr)Al3(AsO4,SO4,PO4)2(OH)6 R 3m 3m

41.05.11.04 Graulichite-(Ce)! CeFe3(AsO4)2(OH)6 R 3m 3 2/m

Strunz Class:

08.BL.13 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BL -With medium-sized and large cations, (OH, etc.):RO4 = 3:1

08.BL.13 Arsenoflorencite-(Ce) (Ce,La)Al3(AsO4)2(OH)6 R 3m 3 2/m

08.BL.13 Eylettersite (Th,Pb)1-xAl3(PO4,SiO4)2(OH)6(?) R 3m 3 2/m

08.BL.13 Arsenoflorencite-(La)* (La,Sr)Al3(AsO4,SO4,PO4)2(OH)6 R 3m 3m

08.BL.13 Arsenoflorencite-(Nd)* (Nd,La,Ce,Ba)(Al,Fe)3(AsO4,PO4)2(OH)6 R 3m 3m

08.BL.13 Florencite-(Ce) CeAl3(PO4)2(OH)6 R 3m 3 2/m

08.BL.13 Florencite-(La) (La,Ce)Al3(PO4)2(OH)6 R 3m 3 2/m

08.BL.13 Florencite-(Nd) (Nd,Ce)Al3(PO4)2(OH)6 R 3m 3 2/m

08.BL.13 Graulichite-(Ce)! CeFe3(AsO4)2(OH)6 R 3m 3 2/m

08.BL.13 Waylandite BiAl3(PO4)2(OH)6 R 3m 3 2/m

08.BL.13 Zairite Bi(Fe,Al)3(PO4)2(OH)6 R 3m 3 2/m

Other Arsenoflorencite-(Ce) Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(AntBidBlaNic4) OPTIC PROP.(AntBidBlaNic4)

See Also:

Links to other databases for Arsenoflorencite-(Ce) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Ecole des Mines de Paris
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Arsenoflorencite-(Ce)

(Ce,La)Al3(AsO4)2(OH)6
Dana No: 41.05.11.01 Strunz No: 08.BL.13
Locality:

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